When do the Tivo sound effects disappear?

I have noticed that certain channels that output digital sound (presumably Dolby Digital) cause my preamp to jump into a different mode (THX Ultra2) in which I can't hear the Tivo sound effects (bings and bongs). The sounds don't seem to come back until I get to a channel or screen that jumps back to the default mode (ProLogic IIX Movie Mode in my case).

I assume this is normal and unavoidable. I take it that the bings and bongs just aren't added into the digital feed? Anyway have a work around (not that it's a huge deal)?

When the audio is DD you won't get the sound effects. When it is PCM you will.

The only workaround is to set the audio output for DD>PCM. Then the TiVo will decode all DD content to stereo PCM audio and you will have the sound effects. At least this is how it works with the SDUI. I've never tested it running the HDUI.

With analog/PCM its in the TiVo allowing TiVo to put in the bloop bloop bloop
With digital the system just passes the bit information to a digital decoder. They could add the hardware but its expensive to do real time digital audio processing.

I feed my Tivo box to my whole house. My main TV is connected to it through my A/V Reciever via HDMI (using DD) so I don't get the sound on that TV. I do hear it on the TV upstairs, that is connected via RCA to a Coax Modulator that then feeds my entire house.

One day I will decide to get HDMI to my upstairs HDTV (I still have an old school non-HD TV in my bedroom), but until then I laugh every time I hear the be-boops playing though my upstairs TV even though I am downstairs where it doesn't sound.